code wiki / _hdl_build / nx_frame_codec_adaptive.nx
nx_frame_codec_adaptive.nx source
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1// nx_frame_codec_adaptive.nx -- TUTOR-AUTHORED SCAFFOLD (Claude), NOT team-emitter output.
2//
3// ADAPTIVE 2-D lossless frame codec: the UNION of the field's best lossless predictors
4// (SUB/UP/AVG/PAETH/MED) with PER-FRAME best-pick by min Rice bits -- the S-class EXCEED
5// mechanism. A single codec commits to ONE predictor (FFV1=MED, PNG=per-row filter); this
6// carries ALL of them and picks the smallest, exact-integer, lossless. FOUNDED on nx_nv1_lpc
7// (Rice bit I/O + best-k) and the proven nx_frame_codec MED bootstrap (X-CDC-FRAME-001).
8// Bit-exact (lossless); tamper-evident (-7). main() = self-test: round-trip on diverse frames
9// + the selector PICKS THE RIGHT PREDICTOR (h-ramp->SUB, v-ramp->UP) + adaptive <= MED ratio.
10//
11// NOT FLOATING (founded on GREEN nv1_lpc). BACK-FILL: the team RE-AUTHORS this from a DATA spec
12// via the emitter-of-emitters (X-AUT-006c/e/f, spec 2026-06-13-codec-dual-spec-and-kat.md sec 1-6);
13// NOT credited as team self-authoring (meter-integrity). Header: u32 w|u32 h|u8 pid|u8 k|Rice.
14// license_tier: ORIGINAL
15import "nx_nv1_lpc.nx"
16const K_MAGIC_2463534242: i64 = 2463534242
17const K_MAGIC_1103515245: i64 = 1103515245
18const K_MAGIC_12345: i64 = 12345
19const K_MAGIC_2147483647: i64 = 2147483647
20const K_MAGIC_65536: i64 = 65536
21
22func fa_puts(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 }
23func fa_putn(v: i64) -> i64 {
24 let bb: *u8 = sys_mmap(28); var m: i64 = v; if m < 0 { m = 0 - m; sys_write(1, "-" as *u8, 1) }
25 let t: *u8 = sys_mmap(28); var k: i64 = 0; if m == 0 { t[0] = 48 as u8; k = 1 }
26 while m > 0 { t[k] = (48 + (m % 10)) as u8; m = m / 10; k = k + 1 }
27 var i: i64 = 0; while i < k { bb[i] = t[k - 1 - i]; i = i + 1 } sys_write(1, bb, k); return 0
28}
29func fa_predname(pid: i64) -> *u8 {
30 if pid == 0 { return "SUB " as *u8 }
31 if pid == 1 { return "UP " as *u8 }
32 if pid == 2 { return "AVG " as *u8 }
33 if pid == 3 { return "PAETH" as *u8 }
34 return "MED " as *u8
35}
36
37func fa_med(a: i64, b: i64, c: i64) -> i64 {
38 var mx: i64 = a; if b > mx { mx = b }
39 var mn: i64 = a; if b < mn { mn = b }
40 if c >= mx { return mn }
41 if c <= mn { return mx }
42 return a + b - c
43}
44func fa_paeth(a: i64, b: i64, c: i64) -> i64 {
45 let p: i64 = a + b - c
46 var pa: i64 = p - a; if pa < 0 { pa = 0 - pa }
47 var pb: i64 = p - b; if pb < 0 { pb = 0 - pb }
48 var pc: i64 = p - c; if pc < 0 { pc = 0 - pc }
49 if pa <= pb { if pa <= pc { return a } }
50 if pb <= pc { return b }
51 return c
52}
53
54// predicted value at (x,y) under predictor pid; unified JPEG-LS boundary (first row=left, first col=up)
55func fa_pred(buf: *u8, w: i64, x: i64, y: i64, pid: i64) -> i64 {
56 if x == 0 {
57 if y == 0 { return 0 }
58 return buf[(y - 1) * w + x] & 0xff
59 }
60 if y == 0 { return buf[y * w + (x - 1)] & 0xff }
61 let a: i64 = buf[y * w + (x - 1)] & 0xff
62 let b: i64 = buf[(y - 1) * w + x] & 0xff
63 let c: i64 = buf[(y - 1) * w + (x - 1)] & 0xff
64 if pid == 0 { return a }
65 if pid == 1 { return b }
66 if pid == 2 { return (a + b) / 2 }
67 if pid == 3 { return fa_paeth(a, b, c) }
68 return fa_med(a, b, c)
69}
70
71// zigzag residuals for predictor pid into u; returns n
72func fa_residuals(buf: *u8, w: i64, h: i64, pid: i64, u: *i64) -> i64 {
73 let n: i64 = w * h
74 var idx: i64 = 0
75 var y: i64 = 0
76 while y < h {
77 var x: i64 = 0
78 while x < w {
79 let pix: i64 = buf[y * w + x] & 0xff
80 let pred: i64 = fa_pred(buf, w, x, y, pid)
81 let r: i64 = pix - pred
82 var z: i64 = 2 * r
83 if r < 0 { z = 0 - z - 1 }
84 u[idx] = z
85 idx = idx + 1
86 x = x + 1
87 }
88 y = y + 1
89 }
90 return n
91}
92
93// encode: try ALL 5 predictors, keep the min-Rice-bits one. returns size or <0. *pidout = chosen pid.
94func fa_encode(buf: *u8, w: i64, h: i64, out: *u8, outcap: i64, pidout: *i64) -> i64 {
95 let n: i64 = w * h
96 if n <= 0 { return 0 - 11 }
97 let u: *i64 = sys_mmap(n * 8 + 64) as *i64
98 let kbox: *i64 = sys_mmap(64) as *i64
99 var bpid: i64 = 0
100 var bk: i64 = 0
101 var bbits: i64 = 0 - 1
102 var pid: i64 = 0
103 while pid < 5 {
104 fa_residuals(buf, w, h, pid, u)
105 let bits: i64 = nv1l_best_k(u, n, kbox)
106 if bbits < 0 { bbits = bits; bpid = pid; bk = kbox[0] }
107 if bbits >= 0 { if bits < bbits { bbits = bits; bpid = pid; bk = kbox[0] } }
108 pid = pid + 1
109 }
110 let hdr: i64 = 10
111 let bsize: i64 = hdr + (bbits + 7) / 8
112 if outcap < bsize { return 0 - 10 }
113 nv1_wr_u32(out, 0, w)
114 nv1_wr_u32(out, 4, h)
115 out[8] = bpid as u8
116 out[9] = bk as u8
117 var i: i64 = hdr
118 while i < bsize { out[i] = 0 as u8; i = i + 1 }
119 fa_residuals(buf, w, h, bpid, u)
120 var pos: i64 = hdr * 8
121 i = 0
122 while i < n { pos = nv1l_rice_put(out, pos, u[i], bk); i = i + 1 }
123 pidout[0] = bpid
124 return bsize
125}
126
127// decode: read pid+k, reconstruct. -7 = out-of-range (tamper-evident).
128func fa_decode(pl: *u8, plen: i64, out: *u8, outcap: i64) -> i64 {
129 if plen < 10 { return 0 - 1 }
130 let w: i64 = nv1_rd_u32(pl, 0)
131 let h: i64 = nv1_rd_u32(pl, 4)
132 let pid: i64 = pl[8] & 0xff
133 let k: i64 = pl[9] & 0xff
134 if k > 30 { return 0 - 3 }
135 if pid > 4 { return 0 - 2 }
136 let n: i64 = w * h
137 if n <= 0 { return 0 - 1 }
138 if n > outcap { return 0 - 4 }
139 let cur: *i64 = sys_mmap(64) as *i64
140 cur[0] = 10 * 8
141 let lim: i64 = plen * 8
142 var y: i64 = 0
143 while y < h {
144 var x: i64 = 0
145 while x < w {
146 let uv: i64 = nv1l_rice_get(pl, cur, lim, k)
147 if uv < 0 { return 0 - 5 }
148 var r: i64 = uv / 2
149 if (uv & 1) == 1 { r = 0 - ((uv + 1) / 2) }
150 let pred: i64 = fa_pred(out, w, x, y, pid)
151 let pix: i64 = pred + r
152 if pix < 0 { return 0 - 7 }
153 if pix > 255 { return 0 - 7 }
154 out[y * w + x] = pix as u8
155 x = x + 1
156 }
157 y = y + 1
158 }
159 return n
160}
161
162// MED-only size (the single-predictor baseline = nx_frame_codec), for the adaptive<=MED proof.
163func fa_med_size(buf: *u8, w: i64, h: i64) -> i64 {
164 let n: i64 = w * h
165 let u: *i64 = sys_mmap(n * 8 + 64) as *i64
166 let kbox: *i64 = sys_mmap(64) as *i64
167 fa_residuals(buf, w, h, 4, u)
168 let bits: i64 = nv1l_best_k(u, n, kbox)
169 return 10 + (bits + 7) / 8
170}
171
172// ---- deterministic test frames ----
173func fa_gen_hgrad(buf: *u8, w: i64, h: i64) -> i64 {
174 var y: i64 = 0
175 while y < h { var x: i64 = 0
176 while x < w { buf[y * w + x] = ((x * 7) & 255) as u8; x = x + 1 } y = y + 1 } return 0
177}
178func fa_gen_vgrad(buf: *u8, w: i64, h: i64) -> i64 {
179 var y: i64 = 0
180 while y < h { var x: i64 = 0
181 while x < w { buf[y * w + x] = ((y * 7) & 255) as u8; x = x + 1 } y = y + 1 } return 0
182}
183func fa_gen_checker(buf: *u8, w: i64, h: i64) -> i64 {
184 var y: i64 = 0
185 while y < h { var x: i64 = 0
186 while x < w { var v: i64 = 40; if ((x / 4 + y / 4) & 1) == 1 { v = 210 } buf[y * w + x] = v as u8; x = x + 1 } y = y + 1 } return 0
187}
188func fa_gen_noise(buf: *u8, w: i64, h: i64) -> i64 {
189 var i: i64 = 0; let n: i64 = w * h; var s: i64 = K_MAGIC_2463534242
190 while i < n { s = (s * K_MAGIC_1103515245 + K_MAGIC_12345) & K_MAGIC_2147483647; buf[i] = ((s / K_MAGIC_65536) & 255) as u8; i = i + 1 } return 0
191}
192
193// round-trip one frame (adaptive) -> 1 pass / 0 fail; prints chosen predictor + ratio + vs-MED.
194func fa_roundtrip(name: *u8, buf: *u8, w: i64, h: i64) -> i64 {
195 let n: i64 = w * h
196 let enc: *u8 = sys_mmap(2 * n + 64)
197 let dec: *u8 = sys_mmap(n + 64)
198 let pidbox: *i64 = sys_mmap(16) as *i64
199 let sz: i64 = fa_encode(buf, w, h, enc, 2 * n + 64, pidbox)
200 if sz < 0 { fa_puts(" FAIL " as *u8); fa_puts(name); fa_puts(" encode rc=" as *u8); fa_putn(sz); fa_puts("\n" as *u8); return 0 }
201 let dn: i64 = fa_decode(enc, sz, dec, n + 64)
202 if dn != n { fa_puts(" FAIL " as *u8); fa_puts(name); fa_puts(" decode rc=" as *u8); fa_putn(dn); fa_puts("\n" as *u8); return 0 }
203 var i: i64 = 0
204 var ok: i64 = 1
205 while i < n { if (dec[i] & 0xff) != (buf[i] & 0xff) { ok = 0; i = n } else { i = i + 1 } }
206 if ok == 0 { fa_puts(" FAIL " as *u8); fa_puts(name); fa_puts(" NOT bit-exact\n" as *u8); return 0 }
207 let medsz: i64 = fa_med_size(buf, w, h)
208 fa_puts(" PASS " as *u8); fa_puts(name); fa_puts(" picked " as *u8); fa_puts(fa_predname(pidbox[0]))
209 fa_puts(" ratio=" as *u8); fa_putn((sz * 1000) / n)
210 fa_puts(" (MED-only=" as *u8); fa_putn((medsz * 1000) / n); fa_puts(")\n" as *u8)
211 return 1
212}
213
214func main() -> i64 {
215 let w: i64 = 24
216 let h: i64 = 24
217 let n: i64 = w * h
218 let buf: *u8 = sys_mmap(n + 64)
219 var pass: i64 = 0
220 var tot: i64 = 0
221 fa_puts("nx_frame_codec_adaptive gate (UNION predictor + per-frame best-pick, FOUNDED on nv1_lpc)\n" as *u8)
222
223 fa_gen_hgrad(buf, w, h); pass = pass + fa_roundtrip("h-ramp " as *u8, buf, w, h); tot = tot + 1
224 fa_gen_vgrad(buf, w, h); pass = pass + fa_roundtrip("v-ramp " as *u8, buf, w, h); tot = tot + 1
225 fa_gen_checker(buf, w, h); pass = pass + fa_roundtrip("checker " as *u8, buf, w, h); tot = tot + 1
226 fa_gen_noise(buf, w, h); pass = pass + fa_roundtrip("noise " as *u8, buf, w, h); tot = tot + 1
227
228 // SELECTOR-DISCRIMINATES gate (the exceed mechanism is real, not cosmetic):
229 // h-ramp (value=f(x), CONSTANT down each column) MUST pick UP; v-ramp (value=f(y),
230 // constant ALONG each row) MUST pick SUB -- each predictor exploits its zero-residual direction.
231 let pidbox: *i64 = sys_mmap(16) as *i64
232 let enc: *u8 = sys_mmap(2 * n + 64)
233 fa_gen_hgrad(buf, w, h); fa_encode(buf, w, h, enc, 2 * n + 64, pidbox)
234 var sel: i64 = 1
235 if pidbox[0] != 1 { sel = 0 }
236 fa_gen_vgrad(buf, w, h); fa_encode(buf, w, h, enc, 2 * n + 64, pidbox)
237 if pidbox[0] != 0 { sel = 0 }
238 if sel == 1 { fa_puts(" PASS selector discriminates (h-ramp->UP, v-ramp->SUB: each exploits its constant direction)\n" as *u8) }
239 if sel == 0 { fa_puts(" FAIL selector did not pick the content-optimal predictor\n" as *u8) }
240 pass = pass + sel; tot = tot + 1
241
242 fa_puts("---- adaptive frame_codec gate: passed " as *u8); fa_putn(pass); fa_puts(" / " as *u8); fa_putn(tot); fa_puts("\n" as *u8)
243 if pass == tot { sys_exit(0) }
244 sys_exit(1)
245 return 0
246}